c# 网络是否连接

c#  网络是否连接

方案一：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 using System.Runtime.InteropServices;//必须引用这个命名空间

 namespace NetWorkConn_Demo
 {
     class Program
     {
         [DllImport("wininet.dll")]
         private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

         static void Main(string[] args)
         {
             int flag = ;
             var isConn = InternetGetConnectedState(out flag, );
             if (isConn)
             {
                 Console.WriteLine("网络已连接！");
             }
             else
             {
                 Console.WriteLine("网络已断开！");
             }
             Console.ReadKey();
         }
     }
 }

方案二：  【不好】

Ping p = new Ping();
            PingReply reply = p.Send("192.168.0.0", 100);
            if (reply.Status == IPStatus.Success)
            {
                Console.WriteLine("网络已连接！");
            }
            else
            {
                Console.WriteLine("网络已断开！");
            }